Siemens 7SJ82 - Settings

Parameter Value Description
1 out of 3
Select the setting for protection applications or for monitoring the voltage
range.
Siemens recommends 1 out of 3 as the default setting. This reflects how
the function behaved in previous generations (SIPROTEC 4, SIPROTEC 3).
3 out of 3
Select this setting when using the stage to disconnect from the power
system (in the case of wind farms, for example).
Parameter: Charact. constant k, Charact. constant α, Charact. constant c
•
Default setting (_:102) Charact. constant k = 1.00
•
Default setting (_:103) Charact. constant α = 1.000
•
Default setting (_:104) Charact. constant c = 0.000
With the parameters Charact. constant k, Charact. constant α, and Charact. constant c,
you define the required inverse-time characteristic curve.
Parameter: Time dial
•
Default setting (_:105) Time dial = 1.00
With the Time dial parameter, you displace the characteristic curve in the time direction.
As usually, there is no time grading for voltage protection and therefore no displacement of the characteristic
curve, Siemens recommends leaving the Time dial parameter at 1.00 (default setting).
Parameter: Additional time delay
•
Default setting (_:106) Additional time delay = 0.00 s
With the Additional time delay parameter, you define a definite-time delay in addition to the inverse-
time delay.
If the setting is left on its default value of 0 s, only the inverse-time delay is operative.
Parameter: Reset time
•
Default setting (_:107) Reset time = 0.00 s
With the Reset time parameter, you define the reset time delay which is started when the voltage falls
below the dropout threshold. Set the parameter Reset time to 0 s when instantaneous reset is desired.
Under network conditions of intermittent faults or faults which occur in rapid succession, Siemens recom-
mends setting the Reset time to an appropriate value (> 0 s) to ensure the operation. Otherwise Siemens
recommends to keep the default value to ensure a fast reset of the function.
Settings
Addr.
Parameter C Setting Options Default Setting
Inverse-T #
_:1 Inverse-T #:Mode
•
off
•
on
•
test
off
_:2 Inverse-T #:Operate &
flt.rec. blocked
•
no
•
yes
no
_:9 Inverse-T #:Measured
value
•
phase-to-ground
•
phase-to-phase
phase-to-phase
_:8 Inverse-T #:Method of
measurement
•
fundamental comp.
•
RMS value
fundamental
comp.
_:108 Inverse-T #:Pickup mode
•
1 out of 3
•
3 out of 3
1 out of 3
6.23.4.3
Protection and Automation Functions
6.23 Overvoltage Protection with 3-Phase Voltage
702 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017